It is well known that cutting oils are used in hobbing with high-speed steel(HSS)hob. Recently, however, hobbing without cutting oils(dry hobbing)with HSS hob has become a center of attraction, because of prevention of environmental pollution and safety for the operator, as well as reduction of costs for cutting oil and its waste disposal. This paper deals with crater wear mechanism, in addition, flank wear and finished surface roughness in dry hobbing, in order to develop hob material and coating for dry hobbing. Experiments were carried out using a fly tool. As a result obtained, it was found that hob material of corresponding to SKH 55 coated with(Al, Ti)N is suitable for dry hobbing in terms of decreasing the crater wear and the flank wear, and in improving surface finish. It was suggested that it is possible to be hobbed in dry by selecting the hob material and coating.